如何以编程方式将扩展的ascii字符发布到facebook帖子？

Question

I'm trying to post special characters to facebook feed, but the characters shown in the facebook post doesn't show as I intended.

$tmp = "αвнιjτυz";

//This code works as I intended, showing "αвнιjτυz" on facebook post
$facebook->api('/me/feed', 'POST', array('message' => $tmp));

//I expect the displayed text in facebook post will be 'вн' but it shows strange characters instead
$facebook->api('/me/feed', 'POST', array('message' => substr($tmp, 1, 2)));

Any ideas why this happens and how to tackle this problem?

Answer 1

I'm guessing this is unicode that you're working in. If so substr() won't work with unicode characters as they're represented with multiple bytes, you will need to use the mb_substr() function instead.

$facebook->api('/me/feed', 'POST', array('message' => mb_substr($tmp, 1, 2)));